add: prev and next button

src/main.py

@@ -19,18 +19,25 @@ def scan_pages(folders: list[Path]) -> list[Page]:
         for folder in folders:
             files: list[Path] = folder.get_files()
 
-            prev: Page = Page(folder.get_absolute_path(), folder.get_name(), None, None, None)
+            page: Page = Page(folder.get_absolute_path(), folder.get_name(), None, prev, None)
 
             raw: Path = Path(folder.get_absolute_path(), folder.get_name() + ".NEF")
             images: list[Path] = [Picture(file, page=prev, raw=raw) for file in files if file.get_name().endswith(".png")]
 
-            prev.images = images
+            page.images = images
 
             if len(images) == 0:
                 bar.next()
                 continue
-            pages.append(prev)
+
+            pages.append(page)
+            if prev is not None:
+                prev.next = page
+            prev = page
+
             bar.next()
+    pages[-1].next = pages[0]
+    pages[0].prev = pages[-1]
     return pages
 
 def create_pages(pages: list[Page]) -> None:

src/page.py

@@ -24,19 +24,31 @@ class Page():
         self._exif: Path = Path(self.path, "exif.txt")
         self._readme: Path = Path(self.path, "readme.md")
         self._raw: Path = Path(self.path, name + ".NEF")
-        self._html: Path = Path(self.path, "page.html")
+        self.html: Path = Path(self.path, "page.html")
+        self.prev: Page = prev
+        self.next: Page = next
     
     def _render_raw(self):
         if not self._raw.exist():
             return None
         return self._raw.get_name()
     
+    def _render_prev(self):
+        if self.prev is None:
+            return None
+        return f"../{self.prev.name}/{self.prev.html.get_name()}"
+    
+    def _render_next(self):
+        if self.next is None:
+            return None
+        return f"../{self.next.name}/{self.next.html.get_name()}"
+
     def _to_html(self) -> str|None:
-        html_rendered = page_template.render(exif=self._render_exif(), raw=self._render_raw(), images=self._render_images(), readme=self._render_readme())
+        html_rendered = page_template.render(exif=self._render_exif(), raw=self._render_raw(), images=self._render_images(), readme=self._render_readme(), prev=self._render_prev(), next=self._render_next())
         return html_rendered
     
     def create(self) -> Path:
-        with open(self._html.get_absolute_path(), "w") as f:
+        with open(self.html.get_absolute_path(), "w") as f:
             f.write(self._to_html())
         self.created = True